Different from single image SR (SISR) [1]}, [2]} and video SR [3]}, [4]}, LF image SR can incorporate the structural prior among sub-aperture images (SAIs) to improve the performance. Most traditional LF image SR methods [5]}, [6]}, [7]}, [8]}, [9]} use disparity information as correlations to enhance the spatial resolution. These methods explicitly register the SAIs using the estimated disparities. However, the performance of these methods heavily depends on the accuracy of disparity estimation. Although many algorithms have been proposed to estimate disparities among LF images, it is difficult to obtain accurate disparities due to the low spatial resolution of LF images.
